Android custom View needs to override ondraw () and other methods

Android custom View needs to override ondraw () and other methods

Android custom View Requires override of ondraw () and other methods. This blog tells you how to write a custom View. We need to inherit the View and then rewrite some

There are many methods, depending on what method you need

First, write a custom View to inherit the View.

Package com. example. engineerjspview; import android. content. context; import android. graphics. canvas; import android. graphics. color; import android. graphics. paint; import android. util. attributeSet; import android. view. motionEvent;/*** custom EngineerJspView * @ author Engineer-Jsp * @ date 2014.10.28 **/import android. view. view; public class EngineerJspView extends View {public float E_X = 188; public float E_Y = 188; Paint paint = new Paint (); public EngineerJspView (Context context) {super (context);} public EngineerJspView (Context context, AttributeSet set) {super (context, set) ;}@ Overrideprotected void onDraw (Canvas canvas) {super. onDraw (canvas); paint. setColor (Color. RED); canvas. drawCircle (E_X, E_Y, 88, paint);} @ Overridepublic boolean onTouchEvent (MotionEvent event) {E_X = event. getX (); E_X = event. getY (); invalidate (); return false ;}@ Overrideprotected void onAnimationStart () {super. onAnimationStart () ;}@ Overrideprotected void onAnimationEnd () {super. onAnimationEnd ();}}

Layout file:

Main activity:

Package com. example. engineerjspview;/*** custom EngineerJspView * @ author Engineer-Jsp * @ date 2014.10.28 **/import android. OS. bundle; import android. app. activity; import android. view. menu; import android. view. view; public class MainActivity extends Activity {@ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main );}}

Effect:

Custom View depends on your needs. It is not just about drawing a picture. Here I just want to explain how to rewrite the custom View ~~